Re: New Nvidia driver Gsync support - Gsync Ceilling problem
Posted: 22 Jan 2019, 11:40
Whelp, Battle(non)sense just posted his AMD FreeSync vs. "G-SYNC on FreeSync" feature on an officially Nvidia supported "G-SYNC Compatible" ASUS VG258:
The takeaway (regarding this thread's subject specifically):
1) FreeSync on an AMD GPU and G-SYNC on an Nvidia GPU on this monitor have virtually the same input lag with an appropriate FPS limit.
2) While 138 FPS was enough to keep both FreeSync & G-SYNC in the VRR range with the V-SYNC option disabled, he witnessed bottom screen tearing (which again, is normal due to rapid frametime variances in the upper FPS range with VRR + V-SYNC "Off") until he either lowered the FPS limit to around 110 (again, this number can vary depending on the max refresh rate, as well as the accuracy of the given FPS limiter), or enabled the V-SYNC option (with a 138 FPS cap).
3) 138 FPS + VRR + V-SYNC option on, results in no tearing in the upper FPS range, and virtually no input lag increase over 138 FPS + VRR + V-SYNC option off (as expected).
So there you have it, the upper VRR range on an officially Nvidia supported FreeSync monitor, "G-SYNC on FreeSync" is working properly/as expected with an appropriate FPS limit with either the V-SYNC option off (bottom tearing) or on (no tearing).
Obviously, he didn't test the lower range, so LFC functionality is still up in the air, but it's good to have some of these details confirmed, at least for best case scenario when using this new feature.
The takeaway (regarding this thread's subject specifically):
1) FreeSync on an AMD GPU and G-SYNC on an Nvidia GPU on this monitor have virtually the same input lag with an appropriate FPS limit.
2) While 138 FPS was enough to keep both FreeSync & G-SYNC in the VRR range with the V-SYNC option disabled, he witnessed bottom screen tearing (which again, is normal due to rapid frametime variances in the upper FPS range with VRR + V-SYNC "Off") until he either lowered the FPS limit to around 110 (again, this number can vary depending on the max refresh rate, as well as the accuracy of the given FPS limiter), or enabled the V-SYNC option (with a 138 FPS cap).
3) 138 FPS + VRR + V-SYNC option on, results in no tearing in the upper FPS range, and virtually no input lag increase over 138 FPS + VRR + V-SYNC option off (as expected).
So there you have it, the upper VRR range on an officially Nvidia supported FreeSync monitor, "G-SYNC on FreeSync" is working properly/as expected with an appropriate FPS limit with either the V-SYNC option off (bottom tearing) or on (no tearing).
Obviously, he didn't test the lower range, so LFC functionality is still up in the air, but it's good to have some of these details confirmed, at least for best case scenario when using this new feature.